Wilkinson Pioneer Park Covered Bridge (Cerro Gordo County, Iowa)
Originally built 1969; destroyed by arson 1997; reconstructed 1998
Modern covered bridge over a branch of Shell Rock River at Wilkinson Pioneer Park, southeast of Rock Falls
Open to one-lane traffic

Williams Bend Bridge (Hickory County, Missouri)
Through truss bridge over Pomme de Terre River on CR 281 north of Hermitage, between Route Y and Route U
Open to traffic(?)

Williams Covered Bridge (Lawrence County, Indiana)
Built 1884 by J.J. Daniels
Two-span covered bridge over East Fork White River on Huron & Williams Road
Open to one-lane traffic

Williamsville Bridge (Wayne County, Missouri)
Built 1912 by the Vincennes Bridge Co.; closed to traffic in Feb. 2006 and demolished Aug. 2006
Lost through truss bridge over Black River on CR 417 south of Williamsville
Demolished August 2006

Wilson Hollow Bridge (Jefferson County, Missouri)
Built ca. 1905 by the Joliet Bridge & Iron Co. of Joliet, Illinois. Demolished in the 1990's and never replaced
Lost through truss over Big River south of Vineland on Wilson Hollow Road
Replaced by a new bridge

Wilsons Bridge (Carroll County, Indiana)
Built 1898 by the Lafayette Bridge Co.
Through truss bridge over Deer Creek on CR 300 North
Open to traffic, but in poor condition

Wilton Springs Bridge (Saline County, Missouri)
Built 1907; closed to traffic Sept. 2007
Through truss bridge over Salt Fork on CR 215
Closed to all traffic

Windom Railroad Bridge (Cottonwood County, Minnesota)
Built 1900, replacing an earlier bridge
Two-span through truss bridge over West Fork Des Moines River on the Union Pacific Railroad at Windom
Open to railroad traffic

Windsor Harbor Bridge (Jefferson County, Missouri)
Originally built 1875 by the Keystone Bridge Co. over River Des Peres at Lemay Ferry in St. Louis. Relocated to Kimmswick in 1930; bypassed by new bridge in 1985.
Wrought-iron through truss over Rock Creek at Kimmswick in Imperial
Open to pedestrians only

Windsor Mills Covered Bridge (Ashtabula County, Ohio)
Built 1867; reconstructed 2004
Covered bridge over Phelps Creek on Warner Hollow Road
Open to traffic

Winnebago River Bridge (Floyd County, Iowa)
Built 1925; rehabilitated 1957
Through truss bridge over Winnebago River on 200th Street (CR B43) northwest of Rockford
Open to traffic

Witherspoon Bridge (Hot Spring County, Arkansas)
Lost two-span through truss bridge over Ouachita River on CR 647
Replaced by a modern bridge in 1994

Wittenberg Railroad Bridge (Perry County, Missouri)
This railroad line was completed in 1904, although I don't know if this particular bridge is that old or not
Through truss bridge over Brazeau Creek at Wittenberg on the Burlington Northern Santa Fe railroad
Still in use

Wolf River Bridge (Langlade County, Wisconsin)
Built 1936; rehabilitated 1967
Through truss bridge over Wolf River on WI 52
Open to traffic

Wood Ford Drive Bridge (Washington County, Wisconsin)
Built 1891; rehabilitated 1979
Through truss bridge over Milwaukee River on Wood Ford Drive
Closed to all traffic

Woodland Bridge (Iroquois County, Illinois)
Built 1911
Through truss bridge over Sugar Creek on 2100E Road near Woodland, .5 mi. north of Woodland
Open to traffic

Woolsey Bridge (Washington County, Arkansas)
Built 1925
Two-span through truss bridge over West Fork White River on CR 35
Closed to all traffic Sept. 2007

Wyaconda River Bridge (Lewis County, Missouri)
Lost(?) through truss bridge over Wyaconda River somewhere near La Grange
No longer exists

Wyman Bridge (Washington County, Arkansas)
Built 1908 by the Vincennes Bridge Co.; replaced 2002
Lost through truss over White River on CR 48 (Wyman Road) east of Fayetteville in Fayetteville
Replaced by a new bridge

Yazoo River US 82 Bridge (Leflore County, Mississippi)
Built 1954
Through truss bridge over Yazoo River on US 82 in Greenwood
Open to traffic

Yellowstone River Bridge (Stillwater County, Montana)
Built 1931
Through truss bridge over Yellowstone River on Frontage Road 115
Open to traffic

Youngstown-Poland Road Bridge (Lawrence County, Pennsylvania)
Built 1936 by the Fort Pitt Bridge Works
Through truss bridge over Mahoning River on US 224/PA 551 (Youngstown-Poland Road)
Open to traffic

Zacke Cox Covered Bridge (Parke County, Indiana)
Built 1908 by J.A. Britton; rehabilitated 1991 and 2002
Covered bridge over Rock Run Creek on CR 500 South
Open to one-lane traffic

Zalma Bridge (Bollinger County, Missouri)
Built 1929-30, replacing a 1900 span that was then moved to Gipsy
Through truss bridge over Castor River on MO 51 at Zalma
Open to one-lane traffic on a paved road

Zinni Bridge (Carroll County, Indiana)
Built 1945
Through truss bridge over Wildcat Creek on Prince William Road
Currently undergoing repairs through mid-April 2006

Zumbrota Covered Bridge (Goodhue County, Minnesota)
Originally built 1869; relocated in 1932, 1970, and finally 1997
Relocated covered bridge over North Fork Zumbro River in Zumbrota
Open to pedestrians only